A novel method to reduce the probability of error in the presence of inter-symbol interference (ISI) and additive Gaussian noise is introduced. The proposed technique is based on modifying the characteristic function of the ISI variable used in the Beaulieu series method to evaluate the probability of error for binary symmetric channels, such that some pulses are omitted to reduce the effect of ISI. This is accomplished by mapping words of certain bit lengths to prescribed series of pulses where some of the pulses are omitted (zeros). The probability of error for the proposed method is evaluated for different word lengths using Gaussian pulses. Test results show that certain pulse series of lengths 12 or greater, with free distances of two or more and consisting of 30% zeros or more, would achieve lower probability of error in the presence of ISI and Gaussian noise.
This paper presents a new method which enhances the quality-of-service (QoS) and hence the response time and
queuing delay of real-time interactive multimedia over the Internet. A service class based on differentiated services
mechanism has been developed. Evaluation of response time under different traffic conditions has been conducted via
simulation. Specifically, the impact on routers performance at the boundary of a DS-enabled domain was evaluated
using OPNET and the results are presented. Since audio and video traffic have different needs, priority schemes for
different types of interactive multimedia traffic have been studied to provide control and predictable service, and
therefore, better quality of service.
A new programmable expression for calculating the error probability in the presence of intersymbol interference and Gaussian noise for M-ary pulse amplitude modulation systems is derived by expanding the series method used in the evaluation of the error probability of binary symmetric channels. Error bounds for the expanded method are derived, and evaluation results for systems with Gaussian, Chebyshev, and sinc signaling are provided.
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